Sewing – Elements – Tensioning
Patent
1986-05-20
1987-10-20
Nerbun, Peter
Sewing
Elements
Tensioning
112229, D05B 6300, D05B 4704
Patent
active
047006447
ABSTRACT:
When a lower thread is effected with tension by an upper thread, a lower thread tension device is actuated in a certain working distance with very small resistance to an extent that a lower thread is drawn as if without resistance. If the lower thread is effected with said tension outside of said distance, it is not drawn out with large resistance. An actuation means successively receives information about thread consumed in each of the stitches and information about rotation phase of the sewing machine from a phase sensor. In the distance of a strong resistance, the lower thread is prohibited from drawing, and the thread is tightened in this distance.
REFERENCES:
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
patent: 4301757 (1981-11-01), Tonomura
patent: 4377980 (1983-03-01), Hanyu et al.
patent: 4632048 (1986-12-01), Matsubara
patent: 4638751 (1987-01-01), Hanyu et al.
Eguchi Yasukata
Hanyu Susumu
Hara Kazumasa
Koike Mikio
Janome Sewing Machine Co. Ltd.
Nerbun Peter
Striker Michael J.
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